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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1779069273b4aa20eeefe36cfe4447da3dad7fa68fab4c08b15686d02d214f67' 
  AND token = '03Hyz3RzfNy8RkJ6Eq6FgbEFUabPulv4x6aPYbPgMu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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