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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a03c740251afe1e1e276ebe67d43dd0091910f09f2e531731ab46248f7772a' 
  AND token = 'FXCoQORSDkskIOPxF/PELYVozOHsZdsAF6rgweM1Rso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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