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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f43e1e1d3b76598ac3c34551cfe9c4910099c627a1a5813e7f5ca7a9e8e6e75' 
  AND token = '1ewi+sAx6jHK1q9k7slDRLPt/1e4ejxam64ghO2LgG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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