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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fcc608245fa77f2c18c18410b754fe8b1cefc8d69a4b7da2321dce37cd16579' 
  AND token = 'HxTJi1GWQZXF386yKSVxpuNpVFw6DosVwX9bMmah1ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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