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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92944b849e8b25eb23758f3a83162ddc53517ea970992f27409c7e203b57ad0' 
  AND token = 'vdIB+CNVfLHnoBlr9PBbXyN/2WJsEhS72p2rk5lq4RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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