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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b081850ee1c8f169b36e66d2b7db0e80d9bc0500bd7d96c16b9aa98663835b' 
  AND token = 'mSyJz4JCCpllr9BCGBp2nVpv/lr9UYPMPmaC2J6KEXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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