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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3291888269e4e96628913ee9db5c000b88745bf6ceeaa87d6de4074fe4ff0ce' 
  AND token = 'OldsprXz5Q7stP/2V6XZiS8Nt8v13GIGchyp0VqjGX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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