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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e706a3ab0eca8d53d51be93608e83d29a34447c64086c81cde29b37b2efe16dc' 
  AND token = 'cTaz4abylk4roNmE6inVSscOUXddsSnNQ+OGnMU/tsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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