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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429fe51bdd0ddfdcdf0b407c0d41733405c5e9130a4c7de1eaedf0ba5a21234e' 
  AND token = '89gM1c2EYvNPG0aiIC00NmTvEpatnEm111YNlMb6nJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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