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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52396e6d48d176c9ac09b3c41feea6a307b5b0244da8a57c5a30b22640c5811c' 
  AND token = 'PvhSValvtY7CoJ9eYQYJJpKDdPJbLg/UMoFpJnJLpfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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