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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37ed92339ed7f8c48f3c524aee01216366e463141c8ebe92d9b8276d1fbc2d5' 
  AND token = 'fQVLOnnf/WRQPLY+C8sl0CMUeNbe905rzYWxD7nvGis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}