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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37fba31d25be29091150c5603ee4018a4c55a28950aa397f8967e8faadb3be5' 
  AND token = '11PqSCehPl2WJIfGBDpxHdXp0J4Kn13jfNMyAAnVxJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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