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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf316cb504d0c388a69f1fcf254522e23a7775ac901dc73d1075291d4697c8d' 
  AND token = '7LPm3GB9Gm90vIAZ77yII9qcQ7l3cDBmlAyFHUIycXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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