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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d079323b17012c062197e5717a5d0987015f42c4a7223cd96ef829d3155d250' 
  AND token = 'nsCHv6tZQKqNH+mSWpXnRTzMpEAikRN6+AqsuUeorZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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