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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651257b6a8e3101faf0b6a4f6862c55310140a5de26d409247a8ca1315b5f6ec' 
  AND token = '158fSy43d3+xXyu+djICUiz1qCDbdDkp/m0+a9EiWzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00149

JSON explain

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