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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d83661e3911943c4f8f205234b7f06bd3eb92a71981defda83bb97b003ff55d' 
  AND token = '1M7wktSNOcN5h1w1U9lY4QZLurOUNvxtuhJUsfAQQZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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