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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1df84641f03043c2faa83da713a8a03329e99c69c02cafab35952befc34d51' 
  AND token = 'DmJ9XXMuSX650XfgatBLCP6a7h2HZV/nb/fGMgXs9LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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