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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dee49ec294491f2e60cca7b80e203d4509762b30dc0ef82a6538444cf92e17c' 
  AND token = '4JCBN7wB/rHAOOi8Q0d3Vwnd7+Ixzfn8wpPG2+njVbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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