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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47767da1c79c144cea9ab48fedf738c91e6db2b647eef5faed4e6bbfd5ddd4d2' 
  AND token = 'JjY9rCybQ/0v0YdBddGxeeLb6d5u4cIEKFgZnxHFEXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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