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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f635adb5fb13f3e600737bff26f6847558d3253820b3ee3c0c8c25d195747918' 
  AND token = 't9lYAwkZMFUAIG0NUlyPNd4e2nbJOuuqrmbSStdGWrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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