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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266772810327f073408e35d55aa7cd2313189f1d93146fea7e4ca9d51ab0ae19' 
  AND token = 'l57dlssEMUy9zZC5pfQMHZXuKQIlfTK3b4Lj0pN7lX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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