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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed0d6c43ba2391c60f9934b219b0786f2b7b23784da2d3c1e8f5066b52ca0056' 
  AND token = 'ETeGoU1Ktx3J9hGCQii57BLjIA3eBkG/6s8UkH5KDTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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