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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c7261a3c768c40990fe9963f6b088b8e29a8e31c7e7d5c8753d7b2f0b55bd8' 
  AND token = '+aEyePQiD/kYBDV6dTdciORHlCutcdVDkua+rGIMnDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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