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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f20b5a7338327c0a68a5699b063f7a2ea67cae5088f33d7f9c1ee8e17fc9aaf' 
  AND token = 'VpRHbQHJPsnEeO4+h1Y6P4C3MV14ji5cREf8YH6i4wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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