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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0b1d4034351ea6f43521d62dac2554d611c4a1133a0a3e23ae02e81b066a80' 
  AND token = 'gxTqqHK3m+b9x6FVrbpLotpPPLwXRHBmI7ZMS515/WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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