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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ac655c06e6ae26e7c58e586b9bd6a0e1375e56465be2e8d76ef3bb05dc9c88' 
  AND token = 'K/GiV/ZlOfBfvDMH2oAAuNI5i9x1TkWA8pMVkUoUFhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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