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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3a8aedff9b244c96d538d3b1283fd0c6d6c6b964a14b89b6010ebfe97ef3fb' 
  AND token = 'ekI6BoQY1/CeQyo83Kk/YwlrbTNNpZ5MRqmUr/8RtbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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