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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ab558bf0ba213f9d03cb0880e50095035772d3c5a80322e9168de1a3a37dfc' 
  AND token = 'OQO3wTQqxuNSPe9noQw2cZ+jP8sghREgAe1oBQLDZ3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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