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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c5c191b7f7db8e2856a4bfaf39befcc8f227d9a691ddb204ea1fd587469fa5' 
  AND token = 'Zj3w6kW5RplplYRoInCqycbvyQ9CUfBBFWu0QwqwfXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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