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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889a4c1e1de34d4bb3676af4e9093d0e9052b8bbb5864a2e4b5e0162a4ced93f' 
  AND token = '6Ij34IAhXGckIiq77kak/djehvPOEfWXEapIS85icMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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