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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1cdf9171627a67c4edb6fcbcd63106aa129eb23aa9e5f857e168ed8eaa6b9a9' 
  AND token = '2/6x1IbB3xJxuRc00moHVlRMB3Jw2xp+x364xn4DhLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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