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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd000bc980494b50801132fd8b700a9b0f825ffcf7d213f4d4c55f379e8a1495c' 
  AND token = 'T+N8sfGH5BisvrGcZKs7rPthV2JF9fX+CMo70h89qxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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