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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3b3aafb36990d0e702ae08c3f0880afaa4d85c4b2e3b580e85124b99e0a824' 
  AND token = 'aZNrlkymn6bEuolbmOiU+HqcdSLSW935aNg+pTIbpoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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