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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea954d39253b5b4cdd6dd3fa5e28551c860b5ec10b4224ffc673948fe3d544c' 
  AND token = 'dTbnpQp/cblRY7q/kB1kB3A1s4cTiJWBe7cB8kN/j4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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