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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15994eecc68781fccf35c2f6ff9c8550d4898d5fceabb5ffb2848a6b470df5ac' 
  AND token = 'OZgx3prwZZmFjQOtrY+nRzi7RHxutWYTrmUzlmZBtU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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