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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f92984c6aaa91011ce33d207cd40245013de9b6a276a965cbd1c0fd62a71b3' 
  AND token = 'GJjyVcdWwiEO9oUEr/nqrzxV0V8q3Jli+nJm7LGW41k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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