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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa8338be5cdea59d7b87f83ac3d6a0ab55b06d2275fcc96e3973d5368ea4a3d' 
  AND token = 's3Wl7yAqDlC4JuL8V/RINAWfs09FVU/pq7b+AfUXdSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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