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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8570b12a5378ba745ecb238f7a5f4ad4919fc2b945693ab0a64e0b2734f4096d' 
  AND token = '3i3NGKNkN8M+X43B4DRDiobklYlxgo/a8HS9MJU8fKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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