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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000fd82b9009033da6b1f14579a7f61893e2a4907f5aee9da5f218516736a9e4' 
  AND token = 'YJhyBy8epAWjDH0lcvrpkMyigDyPfRXLJ7E4KjJhp0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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