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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ddc556559705175b5a016d0056e5618a2ef493a5b13ff9f5d17864c24ff9ff' 
  AND token = 'Gm45HvthvZH1ffmvzw96cg7ZroM+rHZhKhyv3+aPV6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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