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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7833eeb85b365a67e3aa953ca17e874fde90b75bcc793a7ea3dccdbf140985' 
  AND token = 'T3QsqiSYT6LKmBGff8PKNBA6P+r+eWk9mCY3+t8Ipqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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