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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f82917d1e9bc824660425837bae6075641a7e65a6a8df0fde618a45cab1220' 
  AND token = '6Jek8XDeo26rjEfG5/1r+8kEeQ2C5ypHhnyFghqoDUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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