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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9660e8bcf343c70acdf1a5dc1b5634740e4cef143a8c3b3a0ce45d9d7ee55709' 
  AND token = 'e+XjIsvfxKO+CGkJK7Yuoobnf8oUcIApWaNVGkIhyWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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