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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e089224f9b2d72a2d95aa35405ea2e1f02e8babdac5d51a23e140d7cd2e796' 
  AND token = 'wMm/IcrXOqofoZozV07AcpqV4QXEyAYzxiNglnAm7tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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