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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67715e47a4fd9bd760565217a935567361f471165608c8f5f149a75641544812' 
  AND token = '89yDqY3xg7gbnEioL5Eec71aVH4rUR1W4vscdzfX0yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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