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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883fd42b49b28137988bfb4e1de33283257b880632399d42ca1c14051a1507ff' 
  AND token = '5nzDTXwk+mXH3KXWg+qN35a2sA2cQ1CNftx2rkB2fL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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