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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f1a192391cd7f6cb24728889ab646312c4f2f9fb9da3fae2e063e0f0f78da1' 
  AND token = 'baKm3EztSlmqaK4pAS2QafRr9Dl0M0wK5jG3fwFb+GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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