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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df3ec5d4363b6eb2bd617b7d6c0365914e30ba467c8063ee283e5e8c2037678d' 
  AND token = 'THGMob3lzGpVhK/XsvGt7QHBUzSnSp+SXSuOlSEhIhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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