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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7063353cf0733fc496b5195e5f5deb48518632136e5081df8cf46871c3825d75' 
  AND token = '2Eqif6LLS48zPOYW9O39/jQFJs+rFfQih7OKM/TN12w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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