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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569aa7a11e8a04d730895cb2aa9b0f7598c324055ad7724a12ce7d101963b3cc' 
  AND token = 'IphbIhoHDEivslc6yyhSar0wvJz8SE5erRUHYLCEHBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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