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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94152ebf7368830e22a0beb884b9f1b3dd832a0684c5af2e3b3b16751fdd40a2' 
  AND token = 'b2IdFW++jsnDBp3Uh8feCUvkBTOGfkODwTBFa+fwMdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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