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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '845f841c568c6656f45ee63bd6d991e706a9f4cfd98c18e39c626b2149e485bc' 
  AND token = 'PxGFe9E+HJLrO0wuzc3masadgzjqiDhMl5BPOTswKxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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