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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f67d8370ad54d37332b812f743ae388626e2c96bc4b4f8cb5cbabc5284ea1d7' 
  AND token = 'GIF2alL3TtXPMyo0MF66M8XTuEYHmP8XuFOzZ9AbNE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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