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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb23b3d9e0ab4e12f1bc1d4d5300ab95ad3228bcdbdee4e67c55645bd939cedc' 
  AND token = 'jZ5sJZh5XF+saFt0bMXP17vzkwZZW4q8JKPPjd4aBFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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