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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88022acf4612e7b60de2eb4aa18f5e70e7c7461cc4a84a08eed9da75b14cf4c' 
  AND token = 'wW/OElEtxkMiXRii+B9gQLCWYgR26/xqtzRkbnBSsic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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