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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef3b0625cd9a3c5656f95978265957ea5ed95c2c2838fe8eab99edd15384e89' 
  AND token = '9L2T5exKASbjP+3nc4cMGEkXO8rWRR2TTXDrrJdaXbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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