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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5514a1b6d005ec87293d4cbc8c1f6c99cb1434ce8a354d85cfb804bf30c21c8c' 
  AND token = '8WCXOhG8pvrwQLFOeiyNQYr8NT40b+XK63ET8TTL0BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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